To Determine resistance per cm of a given wire by plotting of difference versus current.

APP-12-01

Class XII Apparatus : A given wire whose resistance is to be determined, a d.c, voltmeter (range 0 to 3 V), d.c. ammeter (range about 0 to 1.5 A), a one way key, connecting wires, a battery eliminator or an accumulator or two dry cells (0 to 3 V), sand paper, a rheostat.